Update Dockerfile and add comments in pyproject.toml

Dockerfile

@@ -1,48 +1,13 @@
-FROM python:3.12-slim as base
-
-ENV LANG C.UTF-8
-ENV LC_ALL C.UTF-8
-ENV POETRY_VIRTUALENVS_IN_PROJECT=1
-ENV POETRY_NO_INTERACTION=1
-ENV POETRY_HOME=/opt/poetry
-ENV PYSETUP_PATH=/opt/pysetup
-ENV VENV_PATH="/opt/pysetup/.venv"
-ENV PIP_NO_CACHE_DIR=off
-ENV PIP_DISABLE_PIP_VERSION_CHECK=on
-ENV PIP_DEFAULT_TIMEOUT=100
+FROM python:3.13-slim
+ENV PYTHONUNBUFFERED=1
 ENV PYTHONDONTWRITEBYTECODE=1
-ENV PYTHONFAULTHANDLER=1
-ENV PATH="$POETRY_HOME/bin:$VENV_PATH/bin:$PATH"
-ENV PYTHONPATH="${PYTHONPATH}:/discord_reminder_bot"
-
-FROM base as python-deps
-
-RUN apt-get update && \
-    apt-get install -y --no-install-recommends curl build-essential
-
-RUN --mount=type=cache,target=/root/.cache \
-    curl -sSL https://install.python-poetry.org | python3 -
-
-WORKDIR $PYSETUP_PATH
-COPY pyproject.toml ./
-
-RUN --mount=type=cache,target=/root/.cache \
-    poetry install --only main
-
-FROM base as runtime
-
-# Copy virtual env from python-deps stage
-COPY --from=python-deps $PYSETUP_PATH $PYSETUP_PATH
-
-# Create directory for the sqlite database.
-RUN mkdir -p /home/botuser/data
-
-# Copy source code
-COPY discord_reminder_bot /home/botuser/discord_reminder_bot/
-
+COPY --from=ghcr.io/astral-sh/uv:latest /uv /uvx /bin/
+RUN useradd -m botuser && mkdir -p /home/botuser/data
 WORKDIR /home/botuser
-
+COPY interactions /home/botuser/interactions
+COPY discord_reminder_bot /home/botuser/discord_reminder_bot
+RUN --mount=type=cache,target=/root/.cache/uv \
+    --mount=type=bind,source=pyproject.toml,target=pyproject.toml \
+    uv sync --no-install-project
 VOLUME ["/home/botuser/data/"]
-
-# Run bot.
-CMD [ "python", "/home/botuser/discord_reminder_bot/main.py" ]
+CMD ["uv", "run", "discord_reminder_bot/main.py"]